The HSE has currently suspended targeted inspections of construction sites.
But union officials are calling for a rethink on that policy as major contractors and house builders restart a growing number of jobs.
Unite national officer Jerry Swain said: “It is imperative that the Health and Safety Executive reverses its decision to not undertake proactive inspections during the pandemic.
“If the government believes it is safe for construction workers to be at work, then it is safe for sites to be inspected.
“If workers feel that they health is being placed at risk then they have a legal right to stop working and they should notify Unite of their concerns.
“When workers identify safety concerns, Unite will swiftly contact the contractor to resolve the problems.
“We never disclose who made the complaint but if the contractor fails to make the site safe, they will be named and shamed and the appropriate authorities notified.
“Unite is prepared to work with any house builder to help ensure that social distancing is maintained and other welfare and cleaning provisions are met to protect the workforce.”